From the same cite:
The problem is that no real evidence exists for strong positive feedbacks. Worse, they seem contradicted by the paleoclimatic history of the planet, which has never experienced runaway warming even when CO2 levels were ten or more times higher than they are today. Over geologic time, CO2 correlates very poorly with temperature, leading one to conclude that it's a very weak greenhouse gas.
There is other evidence against a high sensitivity. But the real point is this. Whichever side is right, the media (and a few researchers) have forgotten one of the basic rules of science. Until a theory can predict the unexpected, it should always be viewed critically. The ancient Greeks knew the stars moved, and they had a thousand theories to predict why it would keep happening. Until we can explain past climate shifts and successfully predict future trends, global models are educational toys. Not indisputable evidence.
Some pundits are calling 2008 the year global warming was disproven. I prefer to call it the year science triumphed over alarmism.